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DOI | 10.1016/j.atmosres.2017.09.008 |
Numerical Study of Motion of Falling Conical Graupel | |
Chueh, Chih-Che1; Wang, Pao K.1,2; Hashino, Tempel3 | |
2018 | |
发表期刊 | ATMOSPHERIC RESEARCH |
ISSN | 0169-8095 |
EISSN | 1873-2895 |
出版年 | 2018 |
卷号 | 199页码:82-92 |
文章类型 | Article |
语种 | 英语 |
国家 | Taiwan; USA; Japan |
英文摘要 | In the present study, the attitudes of freely-falling conical graupel with a realistic range of densities are investigated numerically by solving the transient Navier-Stokes equations and the body dynamics equations representing the 6-degrees-of-freedom motion. This framework allows us to determine the position and orientation of the graupel in response to the hydrodynamic force of the flow fields. The results show more significant horizontal movements than those cases with a fixed bulk density of ice assumed in our previous study. This is because the real graupel particles possess the density less than the bulk density of ice, which, in turn, leads to a relatively small mass and a relatively small set of moments of inertia. We demonstrate that, with the six degrees of freedom considered together, when Reynolds number is small, a typical damped oscillation occurs, whereas when Reynolds number is high, amplifying oscillation may occur which leads to more complicated and unpredictable flying attitudes such as tumbling. The drag coefficients obtained in the present study agree with the previous studies and can be approximated by that of spheres of the same Reynolds numbers. We also show that conical graupel can perform significant horizontal translations which can be on the order of 1 km in 1 h. |
英文关键词 | Fall attitudes Conical graupel particles CFD Low Reynolds numbers |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000415908300007 |
WOS关键词 | FLOW-FIELDS ; ICE CRYSTALS ; PARTICLES ; HAIL ; ELECTRIFICATION ; BEHAVIOR ; SHAPE |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/38334 |
专题 | 地球科学 |
作者单位 | 1.Acad Sinica, Res Ctr Environm Changes, Taipei, Taiwan; 2.Univ Wisconsin, Dept Atmospher & Ocean Sci, 1225 W Dayton St, Madison, WI 53706 USA; 3.Kyushu Univ, Res Inst Appl Mech, Fukuoka, Japan |
推荐引用方式 GB/T 7714 | Chueh, Chih-Che,Wang, Pao K.,Hashino, Tempel. Numerical Study of Motion of Falling Conical Graupel[J]. ATMOSPHERIC RESEARCH,2018,199:82-92. |
APA | Chueh, Chih-Che,Wang, Pao K.,&Hashino, Tempel.(2018).Numerical Study of Motion of Falling Conical Graupel.ATMOSPHERIC RESEARCH,199,82-92. |
MLA | Chueh, Chih-Che,et al."Numerical Study of Motion of Falling Conical Graupel".ATMOSPHERIC RESEARCH 199(2018):82-92. |
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